Adding border to a merged region in POI XSSF workbook

Question

I\'m using apache poi 3.7 and I need to put border to a range of cells or merged region.

how can I to apply border to a merged region when the sheet and workbook type is

Answer 1

@Jesanagua just saved my life, I just had to change a bit to match 3.17.

private void setBordersToMergedCells(HSSFSheet sheet) {
    int numMerged = sheet.getNumMergedRegions();
    for (int i = 0; i < numMerged; i++) {
        CellRangeAddress mergedRegions = sheet.getMergedRegion(i);
        RegionUtil.setBorderLeft(BorderStyle.THIN, mergedRegions, sheet);
        RegionUtil.setBorderRight(BorderStyle.THIN, mergedRegions, sheet);
        RegionUtil.setBorderTop(BorderStyle.THIN, mergedRegions, sheet);
        RegionUtil.setBorderBottom(BorderStyle.THIN, mergedRegions, sheet);

    }
}